Enhancing Conductivity\nand Self-Healing in PEDOT:PSS/Poly(ionic\nliquid) Elastomers for Sensor Applications

Poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate)\n(PEDOT:PSS)\ncombined with a poly(ionic liquid) (PIL) represents a promising class\nof elastomeric composites with unique properties suitable for diverse\napplications. In this study, we investigate the conductivity enhancement\nand ion migration capabilities of PEDOT:PSS/PIL elastomers, particularly\nthrough post-treatment with lithium bis(trifluoromethanesulfonyl)imide\n(Li:TFSI) aqueous solutions. The ion migration significantly improves\nthe conductivity, making these materials ideal for electronic devices\nand sensors. Moreover, the PEDOT:PSS/PIL elastomers exhibit self-healing\ncapabilities, as evidenced by their ability to recover the conductivity\nand structural integrity after mechanical deformation. Rheological\nstudies reveal the role of compression-induced viscosity in facilitating\nthe self-healing processes. The adhesive strengths of the PEDOT:PSS/PIL\nelastomers on glass substrates are also explored, highlighting their\npotential for robust material–substrate bonding. Additionally,\nthese elastomers demonstrate effectiveness in stress-sensing devices,\nshowing reliable responses to varying pressure levels for applications\nin human motion detection and sensor technologies. Overall, the PEDOT:PSS/PIL\nelastomers offer a versatile platform with enhanced conductivity,\nself-healing properties, strong adhesion, and responsiveness to mechanical\nstress, paving the way for advancements in flexible electronics, smart\ndevices, and beyond.